> Well, I cleverly unioned each tile with its neighbors before sloping, then > clipped > them back using the original extent, at least that's the theory, but the > process > never finished, which seemed unacceptable given the data size. Still learning!
Most of ST_Clip and ST_Union is now based on a very basic pixel by pixel ST_MapAlgebra. It is in our plans to get an optimized version of ST_MapAlgebra blindly copying chunk of data when possible (mostly when unioning mutually exclusive extents) or to write c version of specific functions like ST_Clip and/or ST_Merge. Right now those process takes time... What is the size of your coverage? Pierre _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
